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Huygens' Principle & Interference of Light questions with solutions

Practice Wave Optics for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.

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Showing 1–10 of 49 questions

MCQeasyWave Optics
Which one of the following phenomena is NOT explained by Huygens’ construction of wavefront?
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AIPMT 1988NEET Previous Year
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NumericmediumWave Optics
Two coherent point sources A and B are in phase and separated by exactly 5λ. A circular observation path is centred at the midpoint of AB and has radius greater than AB ÷ 2. An observer moves once around the complete circle. How many positions of maximum intensity are encountered?
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JEE MainsNEETJEE Advanced
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NumericeasyWave Optics
Two coherent monochromatic light beams of intensities 4I and 9I are superimposed. If the difference between maximum and minimum intensities in the interference pattern is xI, find x.
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JEE Mains 2025 3 April Morning Shift
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NumericeasyWave Optics
Two coherent waves have amplitudes 2a and 3a. At a certain point, their phase difference is 90°. If the intensity corresponding to amplitude a is I₀, the resultant intensity is NI₀. Find N.
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JEE MainsNEETJEE Advanced
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MCQmediumWave Optics
A soap film on a ring of radius 3 cm evaporates. Light of wavelength 580 nm gives minimum transmission every 12 s. Re $fractive$ index is 1.45. The rate of evaporation is:
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JEE Mains 2025 29 Jan Evening Shift
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MCQeasyWave Optics
Interference is possible in:
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AIPMT 1989NEET Previous Year
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NumericeasyWave Optics
Two coherent sources produce intensities 4I and I separately at a point P. The two waves arrive at P exactly out of phase. If the resultant intensity is NI, find N.
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JEE MainsNEETJEE Advanced
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NumericmediumWave Optics
Two coherent point sources A and B emit in phase and are separated by 3.6λ. Considering only points lying strictly between the two sources on the line AB, how many points of minimum intensity occur?
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JEE MainsNEETJEE Advanced
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NumericmediumWave Optics
Two waves of intensity ratio 1 : 9 cross each other at a point. The resultant intensity when the waves are incoherent is I₁. When the waves are coherent and differ in phase by 60°, the resultant intensity is I₂. If I₁/I₂ = 10/x, then x = ____.
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JEE Mains 2024 31 Jan Morning Shift
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MCQeasyWave Optics
Q40. A point light source emits electromagnetic waves uniformly into free space. A detector at distance L from the source measures intensity I₀. The detector is then moved to another point on the same spherical surface centred on the source such that the angular separation between the original and new detector positions is 45°. What intensity is measured at the new location?
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JEE Mains 2026 6 April Morning Shift
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